I would think that if you're aiming for a 1960's scheme, you'd be confined to High Speed Silver with dayglow orange nose, tail and wings trim. I've seen quite a few shots of Syerston aircraft later in the 1960's and they all seem to have swapped to the later Light Aircraft Grey scheme with dayglow orange "Fabglow" patches applied.
The silver/yellow scheme was very short lived and only applied to a few very early JP's. Daygow is the way to go but the problem is that either paint or "fabglow" fades quite quickly, so you'll have a busy time keeping it looking tidy! I just hope the serial fonts are correct - not the ghastly transfers that are used on so many warbirds and museum aircraft these days!
Have you thought about doing the "Vipers" aerobatic team markings applied to some Syertson aircraft? very colourful!